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Electrochemically exfoliated graphene and molybdenum disulfide nanoplatelets as lubricant additives.

Guimarey, M.J.G., Viesca Rodriguez, J.L., Abdelkader, A.M., Thomas, B., Hernandez Battez, A. and Hadfield, M., 2021. Electrochemically exfoliated graphene and molybdenum disulfide nanoplatelets as lubricant additives. Journal of Molecular Liquids, 116959. (In Press)

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DOI: 10.1016/j.molliq.2021.116959

Abstract

In this work, two different 2D materials, molybdenum disulfide nanoplatelets (MSNP) and graphene nanoplatelets (GNP), prepared by electrochemical exfoliation, were used as additives to prepare nanolubricants. The tribological behaviour of the nanolubricants was evaluated under two configurations (pure sliding and rolling/sliding) using two different tribometers: an Universal Macro Materials Tester (UMT-3) and a Mini Traction Machine (MTM2). Wear volume was determined, after the sliding tests, in a confocal microscope (Leica DCM 3D) and the worn surface was analyzed by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) and Raman microscopy. Lubrication mechanisms of GNP and MSNP dispersed in an engine oil for improving its antifriction and antiwear capabilities are proposed. The traction coefficient determination was performed at a 50% of slide-to-roll ratio and at different temperatures. The results showed that the nanolubricants formulated with both types of additives, in their lowest concentration, improved friction and wear in sliding tests, compared to neat engine oil. In addition, only the nanolubricants with the MSNP nano additive at loadings of 0.05 and 0.2 wt% showed friction reductions compared to the commercial engine oil under the rolling/sliding tests.

Item Type:Article
ISSN:0167-7322
Uncontrolled Keywords:Graphene Nanoplatelets; Molybdenum Disulfide Nanoplatelets; Additives; Engine oil; Friction; Wear
Group:Faculty of Science & Technology
ID Code:35865
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:03 Aug 2021 11:40
Last Modified:15 Aug 2021 08:30

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